"The educational purpose of all learning, whether
of facts, techniques, or theories, is that what is learnt should
form the basis of thinking. It is from the thinking more than the
learning that intellectual development proceeds. In science two
different kinds of thinking are possible. The first we may call
creative thinking, the second critical thinking Thinking is
not a popular occupation; it is difficult enough to force oneself
to think let alone encourage others to do the same. We all hope to
acquire principles cheaply whereby our task of sorting things out
may be made easy, rather than face the hard work involved in
reaching decisions for ourselves." - R.A.R. Tricker (1960)